Housing consisting of shells assembled together to protect an electronic device

A housing for protecting an electronic device configured to be fitted to a motor vehicle, the housing comprising:

• a plurality of shells forming a front and a cap assembled together to define jointly an enclosure for housing an electronic circuit card comprising remote connectors;
• and the cap comprising at least two elementary shells, wherein a first elementary shell of the at least two elementary shells comprises at least one mobility means molded into the first elementary shell, wherein the at least one mobility means connects the at least two elementary shells and allows relative movement thereof between the at least two elementary shells, and wherein the cap is formed in one piece, and has a length in a longitudinal direction, the at least two elementary shells are situated side-by-side, each comprising a window near an opposite edge of the cap for the passage of a remote connector out of the enclosure, and said at least one mobility means comprises an elastically deformable member that varies the length of the cap;
• a back wall that further comprises at least two protruding ribs that form a cruciform arrangement.